World

Friday, February 20, 2009

China's J-11B is more advanced than Su-27SK

J-11B cockpitHong Kong, China — Based on the design of the Russian Sukhoi Su-27SK fighter, China has come up with its own domestic version, the J-11B multi-function fighter. Three J-11B prototypes have been manufactured since 2006. After their factory flight tests, they have been evaluated by the People's Liberation Army Air Force 1st Fighter Division, based in Anshan in China's northeast Liaoning province.

A Chinese military industry source has confirmed that pre-production of the fighters will begin this year. "We will not need to assemble more Su-27SKs, because it is old technology given from Russia," the source said.

The J-11B has undergone drastic changes from the original Russian design. A source from the Chinese aerospace industry says that except for the Russian-made engines, 90 percent of the major subsystems fitted on the J-11B, including the radar and optical electronic systems, are made by China. The Chinese aviation company AVIC 1 has already completed testing the 1474 serial radar system to be deployed in the J-11B. The fighter's weapons will also integrate indigenous systems.

A Chinese pilot with more than 20 years of flight experience expressed his high opinion of the Su-27 fighter, describing it as "very easy to fly."

However, as the source from the Chinese military industry points out, some of the parts used on the Su-27SK have a very short lifespan, which has led to a high rate of technical accidents. For instance, frequent problems with the fighter's infrared search and track system have restricted its use in the regular training of combat forces.

To investigate this issue, the author paid a special visit to the Ural Optical and Mechanical Complex in Ekaterinburg, Russia. A Russian source revealed that the company had signed two contracts with a Chinese company to supply parts for an updated IRST system, the OLS-31E. Execution of the contract, valued at US$1 million, began in 2007.

Research and development of the China-made IRST system to be fitted on the J-11B fighters is already completed. The physical appearance of this new IRST is very close to the original Russian OLS-31E, making it appear to be an imitation edition of the Russian system with some upgrades. In fact, the overall performance of the J-11B is now on a par with the Russian-edition Su-27SMK.

The J-11B's fire control radar system uses mechanical scanning, integrates more functions and features a modular design. The fighter also features substantial changes in the fire control system and the cockpit so the J-11B will be able to fire China's indigenous PL-12 air-to-air missiles and a whole series of other precision-guided weapons. The cockpit has three large color multifunctional displays and two small color multifunctional displays.

In recent years, China's pace of development in airborne equipment has been very fast. The design of its J-10B cockpit has been quite precocious; the rear cockpit seems to have four multifunctional color displays and two small multifunctional displays.

The fact that China is producing a large proportion of the J-11B parts domestically indicates that its demand for parts imported from Russia will decline dramatically during the second phase of the fighter's production. Also, some of the subsystems and equipment are compatible with those used in the J-10A and J-10B fighters.

It is expected that the J-11B's flight control system will also be manufactured in China. This was the leading reason why Russia could not determine whether China would continue to produce Su-27SK fighters in the next phase. In reality, the joint contract between Russia and China for the Su-27SK/J-11 development has now been virtually abandoned by the Chinese side without any consultation with Russia.